UPDATE: Glenn Ferguson has been found. It's understood he has been taken to hospital.
Mandurah Police are seeking the public's assistance to locate Glenn Daniel Ferguson.
The 44-year-old is known to frequent the Halls Head area of Mandurah.
He is described as 180 cm tall, slim build with blonde hair and blue eyes.

Anyone with information on his current whereabouts is asked to contact police on 131 444 (Ref 217427).
Shark alert issued after whale carcass reported at Preston Beach
Kwinana businesses to refuse serving students during school hours
Men attacked, campervan windows smashed in East Rockingham
Entries for 2026 Castaways Sculpture Awards now open
Meadow Springs man pleads guilty to threatening to kill PM and NSW Premier
Person critically injured in North Dandalup crash
Iconic sports broadcaster Dennis Cometti dies aged 76
Teen killed while crossing Warnbro Sound Avenue remembered as cheeky, adventurous boy
Firefighters spend night battling bushfire near Lark Hill Sportsplex